diff --git a/scripts/build_ifta_quarterly_campaign.py b/scripts/build_ifta_quarterly_campaign.py
index f67a8ec..fcaff4c 100644
--- a/scripts/build_ifta_quarterly_campaign.py
+++ b/scripts/build_ifta_quarterly_campaign.py
@@ -176,7 +176,10 @@ def _ifta_filed_token(dot: str) -> str:
 
 
 def _filed_link(dot: str) -> str:
-    return f"{tc.SITE_DOMAIN}/api/v1/ifta/filed?dot={dot}&t={_ifta_filed_token(dot)}"
+    # The "I already filed" handler is an API route, so it must hit the API host
+    # (api.performancewest.net), NOT the Astro site host (performancewest.net).
+    api_base = os.getenv("PUBLIC_API_URL", "https://api.performancewest.net").rstrip("/")
+    return f"{api_base}/api/v1/ifta/filed?dot={dot}&t={_ifta_filed_token(dot)}"
 
 
 def main() -> int: